Just placing your units behind walls gives them some useful cover , without having to actually deploy right along it {ie without having to use the specific feature , like what you do in the tutorial behind those log piles} .
This allows your unit to use its' full firepower potential {unless the enemy is closer to the wall than you , in which case the greater advantage goes to them} .
Any bugging of the feature must be intermittant and/or specific to certain conditions because it worked pretty much "as advertised" for me last night .
Try just standing them behind {and close to} a wall in custom battles to see if that works for you .
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